Abstract
Layered aluminum double hydroxide chloride sorbents, LiCl∙Al 2 (OH) 6 .nH 2 O, Li-LDH, have shown promising application in selective Li extraction from geothermal brines. Maintaining LiCl uptake capacity and retaining a long cycle life are critical to widespread application of sorbent materials. To elucidate the energetics of Li capture, enthalpies of LDH with different Li content have been measured by acid solution calorimetry. The formation enthalpies generally become less exothermic as the Li content increases, which indicates that Li intercalation destabilizes the structure, and the enthalpies seem to approach a limit after the Li content x = 2Li/Al exceeds 1. To improve stability, metal doping of the aluminum LDH structure with iron was performed. Introduction of a metal with greater electron density but a similar ionic radius was postulated to improve the stability of the LDH crystal structure. The calorimetric results from Fe-doped LDH samples corroborate this as they are more exothermic than LDH-lacking Fe. This suggests that Fe doping is an effective way to stabilize the LDH phase.
| Original language | English |
|---|---|
| Pages (from-to) | 2398-2404 |
| Number of pages | 7 |
| Journal | Journal of the American Ceramic Society |
| Volume | 102 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2019 |
Funding
This work was supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. Samuel F. Evans is grateful for a fellowship from the Bredesen Center for Interdisciplinary Graduate Education. This manuscript has been authored by UT‐Battelle, LLC under Contract No. DE‐AC05‐00OR22725 with the US DOE. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid‐up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript or allow others to do so, for United States Government purposes. The US DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://ene rgy.gov/downloads/doe-public-access-plan). This work was supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. Samuel F. Evans is grateful for a fellowship from the Bredesen Center for Interdisciplinary Graduate Education. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US DOE. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so, for United States Government purposes. The US DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
| Funders | Funder number |
|---|---|
| Bredesen Center for Interdisciplinary Graduate Education | DE-AC05-00OR22725 |
| Critical Materials Institute | |
| DOE Public Access Plan | |
| U.S. Government | |
| U.S. Department of Energy | |
| Advanced Manufacturing Office | |
| Office of Energy Efficiency and Renewable Energy |
Keywords
- heat capacity
- high-temperature calorimetry
- lithium aluminum hydroxide chloride
- lithium extraction
- sorbents
